166387911 has 16 divisors (see below), whose sum is σ = 232257024. Its totient is φ = 105753824.

The previous prime is 166387901. The next prime is 166387919. The reversal of 166387911 is 119783661.

It is a cyclic number.

It is not a de Polignac number, because 166387911 - 2⁷ = 166387783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166387919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18070 + ... + 25676.

It is an arithmetic number, because the mean of its divisors is an integer number (14516064).

Almost surely, 2^166387911 is an apocalyptic number.

166387911 is a deficient number, since it is larger than the sum of its proper divisors (65869113).

166387911 is a wasteful number, since it uses less digits than its factorization.

166387911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7950.

The product of its digits is 54432, while the sum is 42.

The square root of 166387911 is about 12899.1438087960. The cubic root of 166387911 is about 550.0142266292.

The spelling of 166387911 in words is "one hundred sixty-six million, three hundred eighty-seven thousand, nine hundred eleven".